This cushion is designed and provided by the same folks who make our quality LA Pumps penis cylinders and pumps. Silicone Cushions can be a helpful addition to penis cylinders, since they will help the cylinder create a stronger seal against the body. These pump sleeves can also add a bit of bulk to penis pumps. While some don't like this bulkiness, it can be great for cutting down on excess space at the base of the cylinder, and creating a snugger fit for the penis. This cushion will accommodate LA Pumps' penis cylinders with a diameter from 1 1/2" to 2 3/4". Happy pumping!